
/**
 * 
 */
package org.springrain.frame.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

/**
 * IP校验工具类
 *
 * @copyright {@link weicms.net}
 * @author springrain<Auto generate>
 * @version 2013-03-19 11:08:15
 * @see org.springrain.frame.util.IPUtils
 */

public class IPUtils {

	private IPUtils() {
		throw new IllegalAccessError("工具类不能实例化");
	}

	/**
	 * ip校验
	 * 
	 * @param s
	 * @return Boolean
	 */
	public static Boolean isIpAddress(String s) {
		String regex = "(((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))";
		Pattern p = Pattern.compile(regex);
		Matcher m = p.matcher(s);
		return m.matches();
	}

	/**
	 * 获取客户端ip
	 * 
	 * @param request
	 * @return String
	 */
	public static String getClientAddress(HttpServletRequest request) {

		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}

		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("X-Real-IP");
		}

		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}

		return ip.equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ip;

	}
}
